Hello :))
Southerners were afraid that if they admitted California as a free state, when it came to vote on things like the Wilmot proviso, free states would have majority rule.
Hope this helps
Miguel Hidalgo y Costilla, (born May 8, 1753, Corralejo, near Guanajuato, Mexico—died July 30, 1811, Chihuahua), Roman Catholic priest and revolutionary leader who is called the father of Mexican independence. ... Warned to flee, Hidalgo decided instead to act promptly